Like I said in the post you quoted, the radiator is pushed all the way forwards.
The end tanks are thicker than the radiator core leaving a small gap between the radiator support and the radiator core. I have speed tape covering any gaps.
I have a 28x19 griffin crossflow /2 row/ 1 1/4'' tubes , hi flow water pump/overdriven/vented hood , and it still on the edge, not having a real problem tho.
Like I said , it doesnt even run right /clean till it hits around 190 . I just fpound a problem w/e
Burning nitro is a whole nother deal! Not sure why your hemi made more power with higher engine temps. There isn’t anyone I know of not chilling their engines for more power. When you want to make a hero pull on the dyno you drop the coolant temp.